Did you try a few articles about this?
http://www.google.com/search?q=purple+fringing
Can someone please offer me any advice as to the most effective way to eliminate purple fringing? I find it most annoying under the usual circumstances; high contrast landscape shots of tree foliage, etc. I am struggling through PS6 with the ''Dummies'' book by myself. Thank you so much, in advance, for any assistance you would be kind enough to provide!!! Bob

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